you really should not keep redtail sharks with mbuna...they have different needs....sharks need a lower ph...mbuna need a ph of around 8.4.........lots and lots and lots of rocks piled to the top of the tank..allow algae to grow on all of the rocks so the fish can get proper nutrition...

well...actually you can do whatever you wish...but mbuna are from the rift lakes..the water there is hard and alkaline.....the sharks and algae eaters are from areas with softer more acidic waters...so for me , i just would never mix them....same goes for rift lake fish with plecos...they may survive but somebody is going to suffer...

ok thank you so i should have no other fish other than mubuna because of the ph level but can i have playsand mixed with crush coral. the only reson i am asking is because i learned on youtube that u should have playsand with mubuna because they like to dig and in my tank right now i have playsand.